[Shotimes] engine surging

[Kevin & Cheryl Airth]

Brian:
 Your A/C compressor maybe trying to drag or lock up while turning. I would
change the A/C clutch first and then be ready for a compressor change. Be
aware that your IAB can also be the cause. Unhook the IAB and try to start
the engine and hold the rpm steady using just the throttle. Turn the A/C on
and see if the engine is still surging. This will eliminate the IAB but the
car won't idle much if at all with the IAB unplugged.
Let the list know what your results are?
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> when I drive the car holding the throttle steady, the car surges,like
> opening up the secondaries and then shutting them off.  not really erratic
> but noticeable and annoying.  When you shut off the climate control system
or
> put it on vent it stops doing it.  The air does seem to be blowing cold
air
> though when you turn down the temperature.   ANY IDEAS?